James Peach created TS-4751:
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             Summary: revalidation can skip updating the Age header
                 Key: TS-4751
                 URL: https://issues.apache.org/jira/browse/TS-4751
             Project: Traffic Server
          Issue Type: Bug
          Components: Cache, Core
            Reporter: James Peach


In {{HttpTransact::merge_and_update_headers_for_cache_update}}, the cached 
{{Age}} header is only updated if the server response also contains an {{Age}} 
header. If the revalidation response does not contain an {{Age}}, we will 
retain the cache {{Age}} header which makes the document permanently stale, 
causing a revalidation on every request.



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